Evidence map›Paper›PMID 20618957›Full record

ArticleBMC genomics2010

The Giardia lamblia vsp gene repertoire: characteristics, genomic organization, and evolution.

Rodney D Adam, Anuranjini Nigam, Vishwas Seshadri, Craig A Martens, Gregory A Farneth, Hilary G Morrison, Theodore E Nash, Stephen F Porcella, Rima Patel

Abstract read
In one paragraph

Article in BMC genomics, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 38 papers.

0numbers the graph read from it
0cells of the map it votes in
38citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

38 citing papers in PubMed.

  1. Article
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  9. Review
  10. Article
  11. Genomic comparisons confirmFrontiers in cellular and infection microbiology · 2022
    Article
  12. Article
  13. Article
  14. The compact genome ofMicrobial genomics · 2020
    Article
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Rodney D AdamDepartments of Medicine and Immunobiology, University of Arizona College of Medicine, Tucson, AZ, USA. adamr@u.arizona.edu
Anuranjini Nigam
Vishwas Seshadri
Craig A Martens
Gregory A Farneth
Hilary G Morrison
Theodore E Nash
Stephen F Porcella
Rima Patel

Funding

Infectious Diseases Research Technologies Core - RMLZICAI001052 · NIAID · NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES · PI CHERRY, JAMES · 2009 to 2025
$133.3M
GIARDIA--A MODEL FOR ANCIENT EUKARYOTIC GENOME ANALYSISU01AI043273 · NIAID · MARINE BIOLOGICAL LABORATORY · PI SOGIN, MITCHELL L · 2000 to 2002
$2.4M
Studies of Gastrointestinal Parasitic DiseasesZIAAI000161 · NIAID · NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES · PI NASH, THEODORE · 2009 to 2016
$1.8M
GIARDIA--A MODEL FOR ANCIENT EUKARYOTIC GENOME ANALYSISR01AI043273 · NIAID · MARINE BIOLOGICAL LABORATORY · PI SOGIN, MITCHELL L · 1998 to 1999
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Intramural NIH HHSNIAID NIH HHS AI43273
6 · The paper itself

Abstract

backgroundGiardia lamblia trophozoites colonize the intestines of susceptible mammals and cause diarrhea, which can be prolonged despite an intestinal immune response. The variable expression of the variant-specific surface protein (VSP) genes may contribute to this prolonged infection. Only one is expressed at a time, and switching expression from one gene to another occurs by an epigenetic mechanism.

resultsThe WB Giardia isolate has been sequenced at 10x coverage and assembled into 306 contigs as large as 870 kb in size. We have used this assembly to evaluate the genomic organization and evolution of the vsp repertoire. We have identified 228 complete and 75 partial vsp gene sequences for an estimated repertoire of 270 to 303, making up about 4% of the genome. The vsp gene diversity includes 30 genes containing tandem repeats, and 14 vsp pairs of identical genes present in either head to head or tail to tail configurations (designated as inverted pairs), where the two genes are separated by 2 to 4 kb of non-coding DNA. Interestingly, over half the total vsp repertoire is present in the form of linear gene arrays that can contain up to 10 vsp gene members. Lastly, evidence for recombination within and across minor clades of vsp genes is provided.

conclusionsThe data we present here is the first comprehensive analysis of the vsp gene family from the Genotype A1 WB isolate with an emphasis on vsp characterization, function, evolution and contributions to pathogenesis of this important pathogen.

Indexed as

Evolution, MolecularGenomicsAmino Acid MotifsAmino Acid SequenceAntigens, ProtozoanConserved SequenceDNA, ProtozoanGenome, ProtozoanGenotypeGiardia lambliaInverted Repeat SequencesPhylogenyProtein Structure, TertiaryProtozoan ProteinsPseudogenesRecombination, GeneticAntigens, ProtozoanDNA, ProtozoanProtozoan Proteinsvariant surface protein H7, Giardia lamblia

Identifiers

PMID20618957
PMCPMC2996952

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.